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Efficient calculation of the power spectral density of filtered and nonlinearly distorted digital signals 有效地计算滤波和非线性失真数字信号的功率谱密度
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175659
C. Rapp
{"title":"Efficient calculation of the power spectral density of filtered and nonlinearly distorted digital signals","authors":"C. Rapp","doi":"10.1109/ITS.1990.175659","DOIUrl":"https://doi.org/10.1109/ITS.1990.175659","url":null,"abstract":"A closed form method is derived for the calculation of the power spectral density of linear filtered and nonlinearly distorted digital signals, applying to baseband signals as well as to linear modulated M-PSK (phase shift keying) and M-QAM (quadrature amplitude modulation) signals. A method of modeling the output of the transmitter as the output of a Markov chain, is modified in such a way as to avoid the use of large state transition matrices and M-step transition probability matrices. Large amounts of memory space in a digital computer can thus be saved, allowing the calculation of the power spectral density even for signals with large memory. A method for reducing the calculation complexity for M-PSK signals is also presented. The application of the derived formula is demonstrated for square-root-Nyquist filtered binary PSK and quadrature PSK signals, when distorted by a travelling wave tube.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"158 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129601443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Resource management in a hierarchical network 分层网络中的资源管理
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175667
A. Hác
{"title":"Resource management in a hierarchical network","authors":"A. Hác","doi":"10.1109/ITS.1990.175667","DOIUrl":"https://doi.org/10.1109/ITS.1990.175667","url":null,"abstract":"A distributed algorithm for resource management in a hierarchical network is introduced which uses dynamic information about the system state in local and wide area networks. The algorithm uses broadcast information to make decision about process transfer and message routing, considering processor availability and system security. The algorithm establishes a path from the source to the destination by using information about the transfer and waiting time. Performance of the algorithm is analyzed using the elapsed time of process or message transfer and the waiting time to begin transfer. This algorithm can be implemented as part of operating system software to make decisions about process transfer and message routing in a hierarchical network.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134193034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Topology-based intelligent editing/generation of routing plans for telephonic switching equipment 基于拓扑的电话交换设备路由规划的智能编辑/生成
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175622
I. M. Campos, N. Ziviani, J. Árabe
{"title":"Topology-based intelligent editing/generation of routing plans for telephonic switching equipment","authors":"I. M. Campos, N. Ziviani, J. Árabe","doi":"10.1109/ITS.1990.175622","DOIUrl":"https://doi.org/10.1109/ITS.1990.175622","url":null,"abstract":"The authors present GIPE, an interactive intelligent topology-based editor of routing plans for telephonic switching equipment, designed to ask as few questions as possible from its users. Its interface operates with pop-up menus, and requires no typing of information of any kind. Its database is attached to an internal representation of the topology, and, whenever the system cannot make an informed guess, it prompts the user with a window containing all valid alternatives. The system database is composed of a list of node descriptors, the topology, and a set of node and arc attributes, thus encompassing all information relevant for the expert's knowledge and minimizing the number of prompts to the user.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127818102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Wideband ortho-mode Vivaldi antennas 宽带正交模维瓦尔第天线
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175574
A.D. de Macedo-Filho, M. Mosso
{"title":"Wideband ortho-mode Vivaldi antennas","authors":"A.D. de Macedo-Filho, M. Mosso","doi":"10.1109/ITS.1990.175574","DOIUrl":"https://doi.org/10.1109/ITS.1990.175574","url":null,"abstract":"The wideband ortho-mode Vivaldi antenna is composed a set of spatially orthogonal Vivaldi elements suitably fed by an ortho-mode tee. The design considerations and the practical results for two prototypes are given and discussed.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121101087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Site-diversity performance at Ku-band in Peru 秘鲁Ku-band的现场多样性表演
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175602
A. Dissanayake, D. Mccarthy, J. Allnutt, B. Arbesser-Rastburg
{"title":"Site-diversity performance at Ku-band in Peru","authors":"A. Dissanayake, D. Mccarthy, J. Allnutt, B. Arbesser-Rastburg","doi":"10.1109/ITS.1990.175602","DOIUrl":"https://doi.org/10.1109/ITS.1990.175602","url":null,"abstract":"Results of a propagation experiment conducted at a low latitude location are presented. The experiment was designed to address the lack of measured data, at Ku-band frequencies and above, from tropical regions where there is a high incident of rainfall. Sky noise at 11.6 GHz and rainfall measurements were made at two sites separated by 30 km. Both single-site and site-diversity results in terms of derived path attenuation are presented for a single year. Path attenuation results compare favorably with the current CCIR rain attenuation prediction model. Diversity gain was found to be somewhat higher than the prediction based on a model that has given consistent predictions for temperature climates.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121267514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Optimum alternative routing strategy for mobile radio systems 移动无线电系统的最佳备选路由策略
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175638
M. Yacoub, K.W. Cattermole
{"title":"Optimum alternative routing strategy for mobile radio systems","authors":"M. Yacoub, K.W. Cattermole","doi":"10.1109/ITS.1990.175638","DOIUrl":"https://doi.org/10.1109/ITS.1990.175638","url":null,"abstract":"The hexagonal shape of the cells in a mobile radio system is considered as an ideal model. In practice the borders between cells are not clearly defined, but are fuzzy. If a mobile is near a cell boundary, it may well have adequate communication with more than one base station. This property has already been used by the authors to define five alternative routing techniques, whose performances were found to depend on the traffic profile of the system. In the present work, they explore the characteristics of the strategies and devise a method which leads to an optimum strategy. Full instantaneous and mean adaptation (FIMA) was found to be the best strategy; it bounds the performance of all the other ones.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126060089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimal convergence factor for Gauss-Newton algorithms and its application to an adaptive parallel realization 高斯-牛顿算法的最优收敛因子及其在自适应并行实现中的应用
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175639
P. Diniz, J. Cousseau
{"title":"Optimal convergence factor for Gauss-Newton algorithms and its application to an adaptive parallel realization","authors":"P. Diniz, J. Cousseau","doi":"10.1109/ITS.1990.175639","DOIUrl":"https://doi.org/10.1109/ITS.1990.175639","url":null,"abstract":"An efficient approach for the calculation of the optimal convergence factor for Gauss-Newton algorithms is proposed. The method leads to variable step size (convergence factor) algorithms that yield fast convergence, with an acceptable added cost in computational complexity. The results are applied to a recently proposed frequency-domain parallel realization for an adaptive IIR (infinite impulse response) filter, and evaluated in systems identification applications. Simulations confirm the expected results.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126788092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
An adaptive notch filter for frequency and power estimation with application in telephone signaling codes 用于频率和功率估计的自适应陷波滤波器及其在电话信令码中的应用
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175619
A. Brandao, J. Romano
{"title":"An adaptive notch filter for frequency and power estimation with application in telephone signaling codes","authors":"A. Brandao, J. Romano","doi":"10.1109/ITS.1990.175619","DOIUrl":"https://doi.org/10.1109/ITS.1990.175619","url":null,"abstract":"Adaptive second-order notch filters are presented for detection and tracking of multifrequency signals corrupted by noise. The adaptation process of the notch was made from the complex coefficients of the first-order linear prediction error filter, associated with the notch. The theoretical analysis yields simple results which are useful for the detection of sinusoidal components in a spectrum. The least-squares algorithm presented does not require matrix inversion, making it easy to compute. The method makes it possible to obtain the power of the input sinusoid and an accurate frequency estimation. The authors apply the method to MFC and DTMF (dual-tone multifrequency code) digital telephone signaling, and obtain useful results for real-time practical applications.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115408622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
High-quality audio and video signal transmission in a broadband ISDN based on ATD-the problem of cell losses 基于atd的宽带ISDN高质量音视频信号传输中的小区损耗问题
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175578
H. Hessenmuller, S. Nunes
{"title":"High-quality audio and video signal transmission in a broadband ISDN based on ATD-the problem of cell losses","authors":"H. Hessenmuller, S. Nunes","doi":"10.1109/ITS.1990.175578","DOIUrl":"https://doi.org/10.1109/ITS.1990.175578","url":null,"abstract":"In a broadband ISDN (integrated services digital network) based on the asynchronous time-division (ATD) multiplexing technique, cell losses occur which have an adverse effect on the quality of service, particularly on high-quality video and audio signals. A method is described which allows a complete correction of the cell losses. This goal is achieved by combining a forward error correction with a bit interleaving technique on the basis of the (5+48)-byte cell format recommended by the CCITT. Hardware solutions found for terminal adaptors for high-quality video and audio signals implemented in a demonstration model of the European RACE project 1022 are described. The special problem of clock recovery in the cell-structured transmission of signals at constant bit rates is treated in more detail.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116600485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Propagation characteristics of short-range radio links at 60 GHz for mobile intervehicle communication 移动车辆间通信60ghz短距离无线电链路的传播特性
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175600
W. Schafer, E. Lutz
{"title":"Propagation characteristics of short-range radio links at 60 GHz for mobile intervehicle communication","authors":"W. Schafer, E. Lutz","doi":"10.1109/ITS.1990.175600","DOIUrl":"https://doi.org/10.1109/ITS.1990.175600","url":null,"abstract":"It has been shown that a transmission range of 500 m with direct line of sight is achievable at 60 GHz with directional antennas and a transmission power below 2 W. If the line of sight is obstructed by trees, buildings, etc., communication is possible only within a drastically reduced distance. The channel will be non-time- and non-frequency-selective for a bit rate around 1 Mbit/s. The various propagation effects such as power-law with distance, oxygen and rain absorption, edge diffraction, and frequency- and time-selectivity are theoretically examined and a simple two-path propagation model is presented. A more realistic channel model combining the two-path model with multipath propagation is then developed. As expected, the minima of the two-path model are attenuated by the multipath signal. But this advantage is paid for by a lot of shorter fades which in fact could be more easily handled with error correction methods.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130263323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
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